Turn-table end truck and tractor.



L.-H. SHOEMAKER.

TURN TABLE END TRUCK AND TRACTOR;

APPLICATTQN FILED MAR. 17, I917.

' 1,246,478. Patented Nov. 13, 1917.

8 SHEETS-SHEET I. v

WITNESSES INVENTOR ms NORRIS PETERS co, PnorauTun..WAslmcn1-. u. c.

8 SHEETSSHEE,T 2.

PittBIltBd NOV. 13, 1917.

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L.- H. SHOEMAKER.

TURN TABLE END TRUCK AND TRACTOR.

APPUCATION map MAR. 17. 1911.

L.H. SHOEMAKER.

TURN TABLE END TRUCK AND TRACTOR.

APPLlCATlOfl FILED MAR-12.1917- 1,246,478.

Patented-Nov. 13, 1917.

8SHEETS-SHEET a.

FIG. 5

FIG. 6

FIG. 7

if 47 FIGG INVENTOR WITNESSES fl/M L. H. SHOEMAKER.

TURNTABLE END TRUCK AND TRACTOR! APPLICATION FILED MAR. 17. I917.

1 46,478. Patnted Nov. 13, 191%.

8 SHEETS-SHEET 4.

FIG. 1 2 /03 WITNESSES INVENTOR WWM m: Nui'ms PETERS co.. Pnomn-moWASHINGIOH, u c.

L. H.'SHOEMAKEB.

TURN TABLE END TRUCK AND TRACTOR. 7

APPLICATION man 111111.11. 1911.

8 SHEETS- 8H! 5.

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' L. H. SHOEMAKER TURN TABLE END TRUCK AND TRACTOR. APPLlCKT/ION menMAR-.11 1911.

Patented Nov. 13,. 1917.

a SHEETS-SHEET6.

WITNESSES Q m: Noiuls puns cm. Puum-umuu wAsmncron. u. c.

Patented Nov. 13, 1917.

3SHEETS-SHEET 7- l N V ENTO R M W. W

L. H. SHOEMAKER.

TURN TABLE END TRUCK AND TRACTOR.

' APPLICATION FILED MAR. 17, I917- ms Nam-us Psvsns ca, PHOTD-LIYHQ.wAsnmcw-ulv. o. c.

L. H. SHOEMAKER;

wan TABLE END TRUCK AND TRACTOR.

APPLICATION FILED MAR. 17, I911.

1 246,478. 7 Patented Nov. 13, 191 7.

8 SHEETS-SHEET B.

' Q Q v WITNESSES INVENTOR m y iQMK/M WWM i n4: Nmwms perms ca. PnomumoWASNINU mu. n c

unirnn sra'rns LOUIS H. HOEMAKERi or PITTSBURGH, PENNSYLVANIA.

TURN-TABLE END TRUCK AND TRACTOR.

Specification of Letters Patent.

Patented Nov. 13. 191?.

Application filed March 17, 1917. Serial No. 155,492.

and State of Pennsylvania, have invented.

certain new and useful Improvements in Turn-Table End Trucks andTractors, of which the following is a specification.

My invention relates to apparatus known" as turntables and used inturning end for end the locomotives or other rolling stock of railroads,and more particularly relates to the construction of the turntable endtrucks and to the driving mechanism for actuating the traction wheels onthe end trucks.

One object of the invention is to'provide a turntable of improvedconstruction wherein the end trucks, in a vertical plane, are flexiblyconnected, and in a horizontal plane, are rigidly connected to the maingirders of the turntable to thereby permit of limited vertical movementand prevent any substantial relative horizontal movement between thetrucks and girders.

Another object of the invention is to provide a turntable of novelconstruction hav ing a combined end truck and tractor for supporting theends of the turntable girders, and for supplying the tractive forcenecessary in turning or rotating the turn table.

A further object of my invention is to provide a turntable havingsectional end trucks and having the truck sections rigidly connectedhorizontally and flexibly connected vertically to prevent relativehorizontal movement and to permit of limited vertical movement of theend sections of the truck relative to each other.

A. still further object of the invention is to provide a turntablehaving improved driving means whereby the traction Wheels on theflexibly connected end sections of the trucks are driven by a motorpositioned on the turntable girders.

Still further objects of my invention con-- sist 1n the provision of apower actuated turntable having the parts and novel arrangements.constructions, and combinations of parts shown in the drawings, morefully described hereinafter, and specifically covered by the appendedclaims Referring now to the drawings, forming part ofthis'specification, Figure 1 is a plan,

partly in section, showing one end ofa "through turntable having acomblned end truck and tractor constructed and arranged and connected tothe turntable girders in accordance with my invention.

Fig. 2 is a transverse sectional elevation of the end truck shown inFig. 1, the section being taken on the line I'll-11 of Fig. 1.

Fig. 2 is a side elevation showing details in the construction of thevertically flexible and horizontal rigid connection between theintermediate section and end sections of the truck frames of Figs. 1 and2.

Fig. 3. is a sectional elevation on a larger scale, taken on the lineliHHI of Fig. 1, showing details in the construction and arrangement ofthe driving gears employed in operatively connecting the traction wheelswith the turntable driving motor of Figs. 1 and 2. Fig. 4 is a sectionalelevation showing de tails in the construction and arrangement of thetransverse bevel-gear shafts and shaft bearings used with the turntableof Figs. 1 and 2. the section being taken on the line lVIV of Fig. 1.

Fig. 5 is a. sectional elevation, on the irregular line V-V of Fig. 1,showing one construction and arrangement of means for connecting the endtrucks to the turntable girders in accordance with my invention.

Fig. (.3 is a detail sectional levation, taken on the line VI-VI of Fig.1, showing the turntable track wheels as mounted on the end trucks ofthe turntable of Figs. 1 to 5.

Fig. '7 is a sectional elevation on the line VlI-Vll of Fig. 1, showingthe turntable driving motor and support therefor, as mounted on thelongitudinal girders of the turntable.

Fig. 8 is a diagrammatic one arrangement of shafting for drivingturntables constructed in accordance with this invention.

Fig. 9 is a plan, partly in section, showing one end of a deck turntablehaving an end truck and turntable driving mecha-- nism constructed andarranged in accordance with my inyention.

Fig. 10 is a sectional end elevation of the same. the section beingtaken on the line X-X of Fig. 9.

Fig. 10 is a side elevation showing details in the construction of thevertically flexible, horizontallv rigid connections beplan showing.

tween the contiguous ends of the sections of the sectional truck frameused with the "'deck turntable of Figs. 9 to 12-.

I Fig. 11 is a sectional elevation on the line XI-XI of Fig. 9 showingthe sectional end truck of Figs. 9 and 10 connected to the turntablegirders in accordance with my invention so as to be horizontally rigidand vertically movable relative thereto.

Fig. 12 is a sectional elevation, taken on the line XII-XII of Fig. 9,showing details in the arrangement of driving gears connecting thedriving shaft and traction wheels of the turntable end trucks of Figs.9, 10, and 11.

Fig. 13 is a plan partly in section showing details in the constructionand arrangement of a modified form of turntable made in accordance withmy invention.

Fig. 14 is a sectional end elevation of the same, the section beingtaken on the irregular line XIV-XIV of Fig. 13.

Fig. 15 is a sectional end elevation, on the line XVXV of Fig. 13,showing the driving gears by which the driven wheels of the turntableend trucks are actuated, as constructed and arranged in accordance withthis invention.

Fig. 16 is a longitudinal side elevation, part1 broken away and partlyin section, showing details in the construction of the turntable ofFigs. 13, 14, and 15.

In the construction illustrated by Figs. 1 to 8 of the accompanyingdrawings, which show a through turntable, the two parallel mainorlongitudinal girders 22 are obnnected at their ends by transversegirders 3, and, at suitable intervals in the length thereof, by similartransverse girders 4. EX- tending between the transverse girders arelongitudinal beams or girders 5 and girders 6 having their endsconnected to thetransverse girders 3, 4, the girders 5 and 6 supportingthe ties 7 for the locomotive track rails 8, S of the turntable. Theupper surfaces of the top cover plates of the main girders 2 are in aplane considerably above that of the upper surfaces of the girders-3 and4 and the upper surfaces of the girders 3 and 4 are in a plane abovethat of the uppermost surfaces of the top flanges of the beams 5 andgirders 6, this arrangement effecting a material reduction in thenecessary over-all height of the through turntable. (See Fig. 2).

A rectangular opening 9 is formed in the web 10 of the main girders 2,adjacent to each end of these girders, thev web being reinforced byvertical stiffening members 1.1, 12, and horizontal members 13 tocompensate for the material removed in making the openings 9. (See Figs.1, 2, and 5).

The ends of the main girders 2 of the turntable are supported bysectional, wheeled trucks, the trucks being formed of two short ing theshort end sections 14, 14, which are connected .to the ends of a longerintermediate sectlonlo (see Figs. 1, 2, and 2 and an end section 14 ofthe'trucks projects through each of the openings 9 in the main girders2.

The contiguous ends of the beams formend sections 14, 14, and longintermediate section 15 of the trucks are fastened together by angleconnections 16 which are riveted thereto so as to make the truckshorizontally rigid and vertically flexible, the filler plates 17, 17,providing a small amount of clearance 18 between the connected ends ofthe beams forming the truck sections. (See Fig. 2

The pairs of short beams forming each end section 14 of the trucks .areconnected at their ends by plates 19, and, at an intermediate point, bya centrally locatedspring support 20. (Bee Figs. 2 and 2 The ends ofeachend section 14 of the trucks also are connected to the longitudinalgirders 2 by diagonal braces or struts 14 which hold the trucks rigidlyagainst horizontal movement relative to the girders. The connectionplates on the ends of the struts 14 are flexible enough to permit of thedesired slight vertical movement of the end sections 14 of each truckrelative to the turntable girders 2 and to one another.

The spring support 20 which=-is located within an opening 9 in the webof the girders 2 has an integral upwardly projecting cylindrical member21, the upper end of which is rounded to be hemispherical, this roundedend of the projection 21 engaging with the hemispherical depression .inthe lower surface of the saddle 22 which is positioned in the openings9in the web of the turntable girders 2 to limit the vertical rockingmoveinent of the main girders relative to the sectional trucks, whichoccurs during the transfer of locomotives or other rolling stock to andfrom the turntable.

The spring support 20 also has cylindrical projections 23 on itsopposite sides (see Fig. 5), these projections extending throughopenings in the web of the beams forming the end sections 14 of thetrucks. and bolts 24, which preferably are body-bound, are employed tofasten the support 20 in place between the pairs of beams 14, and alsoto hold these beams in spaced relation.

The outer ends of the projections 23 are rounded and extend intovertical grooves 25 formed in the vertical guides 26, 26, the guidesbeing fastened to the vertical sides of the openings 9 in the ends ofthe main girders 2, and the projections 23 by engageunent of the sidewalls of the grooves 25 in the girders 26 preventing horizontal movementof the trucks relative to the main girders, while permitting limitedvertical movement therebetween. (See Fig. 5i.

A helical spring 27 is positioned between vided with a the end sectionst eatre the supports 20 and saddles 22 to connect the supports andsaddles, the springs 27 being put into position under considerable-compression, so that the longitudinal girders 2 will be yieldinglysupported at their ends when the turntable is empt and the weight ofthe. ends of the turntab e will be equally distributedon the four endtrucks.

The end action it of each truck projects through one of the openings 9in each end of the girders 2, and each end section 14 is propair ofwheels 28, 29, which are keyed on the axles 30, 31 for the wheels. Theaxles are rotatably mounted in bearings 32, 32, and 33, 33, which aresecured in pairs to the bottom flanges of the 14; and the wheels 28, 29engage with and are supported upon the circular track formed by the rail3a in the pit in which the turntable is rotatably mounted.

It will, of course, be understood that in each construction shown, theturntable is supported at the middle of its length upon a pivot orcenter bearing, in the usual known manner, so that the turntable isbalanced thereon when empty, any center bearing of approved form beingused, as fol-example, the bearing 108 shown in Fig. 16.

On account of the connections between the outer or short end sections 14and longer intermediate section 15 of the trucks being flexible in avertical direction, each end section 1 to a small extent is movablevertically relative to the middle section 15 and opposite end section1%, and being rigidly connected together horizontally, any relativehorizontal movement of the truck sections is prevented. In this way theload on the turntable is caused to be uniformly distributed upon eachwheel of the trucks, even when irregularities are present in the treadsurface of the circular track rail 34:.

Secured on one end of the axles 31 (or axles for the inner wheels 29)are bevel gears 36' which mesh with bevel pinions 37 on the ends ofhorizontal shafts 33- The shafts 38 are mounted at their ends inbearings 39 which are secured by brackets 40 to the beams'forming theintermediate sections 15 of the trucks.

Although the shafts 38 and bevel pinions 37 are mounted on theintermediate sections 15 and the track wheels 29 and bevel gears 36 onthe end sections 14 of the trucks, the relative vertical movement of thesections is so slight and the locating of the bevel gears relative tothe position of the flexible connections between the truck sections isso nearly central, as to maintain the gears 36, 37, in mesh at alltimes.

The adjoinin ends of the two shafts 38, 38, have bevel pinions d1thereon which mesh with a bevel gear 42 on the lowermost horizontalcross or countershaft 4-3 which is sections of the beams forming mountedin bearings 44, 4A, suspended from the beams forming the intermediatesection 15 of each truck. A spur gear 45 on the shaft 43 meshes with asimilar spur gear 46 on the idler shaft 47 which is mounted in bearings48, d8, on the top flanges of the beams forming the intermediate section15 of the trucks. (See Figs. 1, 2, and 3). The spur gear 49 on one endof the countershaft 47 meshes with the spur pinion 50 on one end of thelong horizontal shaft 51 which extends lengthwise parallel with themain. girders 2 of the turntable. The shaft 51 is mounted in thebearings 52, 52 and, when its length requires, the shaft 51 also isprovided with intermediate bearings. While the shaft 51 for each truckcarrying the spur -pin1ons 50 are mounted on the turntable girders andthe shafts 43 and 47 having the spur gears 45, 46 and 48 thereon areonthe truck frames, the gear 49 and pinion 50 will remain in. mesh duringthe slight relative vertical movement of the truck frames and girders ofthe turntable.

The shafts 51, 51, which extend lengthwise from each end toward thetransverse center of the turntable are provided on their adjacent endswith bevel gears 53, 53, meshing with the bevel gear 54 on one end ofthe horizontal cross-shaft 55 which is conveniently located adjacent tothe middle of the length of the turntable. The shaft 55 is mounted inbearings 56, 57, and has a spur gear 58 on. oneend which is in mesh withthe spur pinion 59 on one end of the armature shaft '60 of the electricdriving motor 61. The motor 61 is secured on a suitable bracket 62fastened to one of the main girders 2 of the turntable, beneath theoperators platform 63 which is located on one side of the turntable.(See Figs. 7 and 8).

In the deck type of turntable shown by Figs. 9 to 12 the parallellongitudinal girders 64, 64, are not widely spaced as inthe through typeof turntable, and the ties 65 for the locomotive track rails 66 rest onthe I cover plates 67 of the longitudinal girders, (SeeFig. 10). a

Each end of the two longitudinal girders 64 has a rectangular opening 68in its web 69, through which the sectional truck frames project, the webof the girders being strengthened adjacent to the rectangular openingsby angles 70 and '71. The girders 64 are fastened together in spacedrelation by diagonal bracing 72 and at their ends and suitable points inthe length thereof, by cross girders or bracing 73, in the usual knownmanner.

Each truck frame has end sections 74;, 74 formed of pairs of parallelbeams which are connected at one end thereof by tie plates 75 to theends of the pairs of beams 7 6 forming the intermediate section of eachtruck frame. The connecting plates 75 rigidly fasten the truck framesections together against relative horizontal movement, while flexiblyconnecting the sections so as to permit of a limited vertical movementof each end section relative to the other and also relative to thegirders 64:. (See Figs. 10 and 10 The pair of beams forming the endsections 74 of the truck frames are fastened together by means of endplates 7 7 7 8 and, on the top flanges thereof by plates 79, 80. The endsections of the flexible truck frames also are connected to the ends ofthe main or longitudinal girders by struts or diagonal bracing 81 and 82so as to prevent relative horizontal movement of the truck frame andgirders while permitting a limited amount of relative vertical movementbetween the main girders and end sections of the truck frames andbetween the truck sections. (See Fig. 9). i

Each opening 68 in the endsiof the main ders 64 is provided with aspring follower or saddle 83 and each end sectidn of the truck frames'isprovided with a spring support 84 which is fastened by bolts. 85 betweenthe pair of beams forming each end section 74. The sides of the castingsforming the spring supports 84: have integral projecting stubs or pins86 which extend through holes in the webs of the beams 7 these pinsforming uides which extend into the vertical slots ormed by the parallelribs 87 on the guide plates 88 of which one is secured on each end ofthe rectangular openings 68 in the main or longitudinal girders. (SeeFig. 11).

The horizontally projecting pins .86, by engagement with the verticalribs 87 act to prevent any horizontal movement of the truck framesections with respect to each other and to the main girders 64, whilepermitting the desired slight relative vertical movement between thesections of each truck frameand between the sectional truck frames andmain girders of the turntable.

Positioned between each saddle 83 and support 84 is a helical spring 89,thesesprings being placed in position under an initial compression,inthe particular springs shown the initial compression being about oneinch, so that when the turntable is empty the ends of the longitudinalgirders 64 will be held in respect to the truck frames, in the liftedposition shown in Fig. 11, by the springs 89. r

The upwardly extending projection 90 on the supports 84 and downwardlyextending progection 91 on the saddles 83 by engagement of their roundedor concavo-convex abutting ends, coact to limit the downward or tiltingmovement of the ends of the longitudinal girders 6 1 when the maximum.load is applied to the end of the turntable, as when a locomotive ispassing on or off the turntable.

frame end sections 74. Secured on one end of the axles 96 for the innerwheel 93 on each end section 7 4 of the trucks is a gear 98 havingslightly beveled teeth, Qsee Fig. 12) and meshing with the gear 98 is asimilar gear 99 which is secured on one end vof a countershaft 100. Thiscountershaft is mounted in bearings 101-101 which are suspended from thelower flange of the beams forming the intermediate section 76 of thetruck frames, and has a spur gear 102 on one end which meshes with aspur pinion 103 on one end of the idler shaft 104. The shaft 104 isrotatably mounted in bearings 105, 105 which are fastened on the upperflanges ofthe beams formin the intermediate section of each truck rameand the idler pinion 103 on the shaft also meshes with the spur drivingpinion 106 on the horizontal driving shaft 107. (See Figs. 9, 10, and12). Theushaft 107 is mounted in suitable bearings-108, which aresupported from the. cross girders of the turntable and at suitableintervals in the length thereof by" transverse girdersllO.

The main girders 108 are supported at the middle of their length upon apivot or center bearing 108*, this bearing, which may be any of thevarious known constructions adapted for such use, being connected totwotransverse girders 110, and restingupon a foundation in the center ofthe pit in which the turntable is mounted.

, The wheeled trucks on each end of the main girders 108 are formed ofend sections 111, 111. and a short middle section 112, to which the endsections are fixedly connected, so as to permit of a slight verticalmovement of one end section relative to the other and rigidly connectedto prevent any relative horizontal movement between the truck sections.Diagonal brac'es 113, 114 are employed to rigidly connect the ends ofthe outer truck sections 111 to theilongitudinal girders 108 in ahorizontal plane and prevent horizontal movement of the trucks relativeto the main girders, while the connections for the bracing are ,made

rea ers flexible enough to permit of the desired limited amount ofvertical movement between the trucks and main girders. (See Fig. 13).

The end sections 111 of the trucks are formed of beams arranged in pairswith the ends of the beams in each pair connected by end plates 115 andangles 116, and between the beams of each pair forming each end sectionof the trucks are the two track wheels 117, 118, these wheels beingkeyed or otherwise fastened to shafts or axles 119 and 120, and theaxles being mounted in airs of bearings 121121and 122-122 W ich arefastened on the lower flanges of the beams forming the end sections ofthe trucks. Positioned between the webs of the beams at about the middleof the length of each end Section of the trucks and placed back to backare short channel beams 123, these channel beams forming supports forthe helical springs 124, 125, by which the ends of the main girders 108are yieldingly held in place on the turntable end trucks. Positionedwithin the rectangular opening 126 in each end of the two main girders108 (see Figs. 14, 15 and 16) are top and bottom follower plates 127,128, these plates having projections 129 on one face thereof whichengage with sides of the adjacent flanges of the beams formin each endsection or the truck. the flanges of the beams bein notched and theprojections engaging t erewith and forming guides for the followerplates. Positioned between the short channel beams 123 on the endsections of the trucks and the top and bottom follower plates 127, 128,are the helical springs 124 and 125, one on each side of the channelbeams. The uppermost spring 124 is heavier or of larger size than thelower one 125 and both springs are put into place under considerablecompression. The upper s ring 124 being the stronger will tend to andhold the ends of the girders 108 in raised position when the turntableis empty, and when a load such as a locomotive is balanced on theturntable, while the lower ring 125 will form a cushion which absor sthe shock transmitted when a locomotive is passing upon'or being removedfrom the turntable.

Keyed or otherwise secured on the overhanging end of the-axles 120 forthe track wheels 118 is a bevel gear 130. The gear wheels 130 mesh witha bevel pinion 131 which is keyed on the horizontal shaft 132 extendingfrom the end of the main girders toward the middle of the length of theturntable. One end of the horizontal shafts 132 is mounted in a bearing133 which is secured on the intermediate section 112 of the end trucks,and the shafts 132 are also supported at suitable intervals in theirlength, 111 bearings 13% mounted on the transverse girders 110 whichconnect the two main gi! ders 108. The adjacent ends of the twohorir-aaital shafts 132 are provided with bevel gears 135 which meshwith a bevel pinion 136 on the horizontal cross shaft 137 locatedadjacent to the center of the length of the main girders. The crossshaft 137 is connected by a coupling 138 to a motor -countershaft 139and the countershaft 139 is connected by suitable reducing gears 110,111 to the armature shaft 142 of the driving motor 143.

The motor is supported on a bracket fastened on the side of one of 108.

The turntables shown in Figs. 13 to 16 being of the deck type, the ties146 are supported on the topcover plates of the'mam girders 108 and therails 147 forming the track on the turntable are directly supported uponthe ties.

I do not claim to be the first to construct a. turntable having awheeled truckprovided with a rocking non-pivotal bearing upon theturntable.

The advantages obtained with turntables made in accordance with myinvention will be appreciated by those skilled in the art. The sectionalend trucks, when connected to the main girders in the manner shown anddescribed, enable a load on the turntable to be uniformly distributedupon'the wheels of the trucks. The wheels on the sectional andvertically movable trucks are positively the main girders driven by amotor positioned on the turntable girders. The springs used inconnecting the girders to the tracks act as absorbers which cushion, theshocks caused by the transfer of locomotives, or other rolling stock toor from the turntable.

Modifications in the construction and arrangement of the parts formingmy improved turntable constructions may be made without departing frommy invention as defined in the appended claims.

I claim:

1. A turntable comprising main girders, a center bearing therefor,wheeled trucks at the ends of said girders, said trucks being made insections, means connecting the trucks to the main girders arranged topermit of limited relative vertical movement and prevent relativehorizontal movement therebetween, means connecting the truck sectionsarranged to permit of limited ver-. tical movement while preventingrelative horizontal movement of one end section relative to the oppositeend section of the trucks and means for rotating the turntable.

2. A turntable comprising main girders, a center bearing therefor,wheeled trucks at the ends of said girders, said trucks being made insections, means connecting the trucks to the main girders arranged topermit of limited. relative vertical movement an" prevent relativehorizontal movement tl erebetween, means connecting the truck sectionsarranged to permit of limited verfl i therebetween, means connecting thetruck tical movement while preventing relative horizontal movement ofone end section relative to the opposite end section of the trucks and amotor on the turntable girders arranged to rotate the turntable.

3. A turntable comprising main girders, a center bearing therefor,wheeled trucks at the ends of said girders, said trucks being made insections, means connecting the trucks to the main girders arranged topermit of limited relative vertical movement prevent relative horizontalmovement sections arranged to permit of limited vertical movement whilepreventing relative horizontal movement ofone end section relative tothe opposite end section of the trucks, a motor on said main girders andreducing gearing operatively connecting the motor and the tractionwheels on said trucks.

' a center bearing therefor, w eeled trucks at the ends ofsaid girders,said trucks being made in sections, means connecting the trucks to themain girders arranged to permit of limited relative vertical movementand prevent relative horizontal movement therebetween, means connectingthe truck sections arranged to permit of limited vertical movement whilepreventing relative horizontal movement of one end section relative tothe opposite end section of the trucks, a motor on said main girders andreducing gearing operatively connecting the motor and the tractionwheels on said trucks, said reducing gearing being positioned andarranged to permit of limited vertical movement of the trucks relativeto the main girders without disengagement of the gears.

5. A turntable comprising parallel main girders, a center bearingtherefor, a sectional truck on at least one end of the girders, a driventraction wheel on said truck, and means connecting the truck sections topermit of limited vertical movement and prevent horizontal movement ofone truck section relative to another section thereof.

6. A turntable comprising parallel main girders, a sectional truck on atleast one end of said girders having a driven traction wheel, meansconnecting the truck sections to permit of limited vertical movement andprevent horizontal movement of one truck section relative to anothersection thereof, a motor on said turntable and means operativelvconnecting the motor and said driven traction wheel.

7. A turntable comprising main girders, sectional trucks to support theends of said girders, means connecting said trucks to the ends of thegirders to prevent horizontal movement of the trucks relative to thegirders, said means yieidingly connecting the ends of said girderstot-he trucks to permit of limited vertical movement of the girdersrelative tothe trucks, traction wheels on said trucks, and means forpositively rotating said traction wheels.

8. A turntable comprising main girders,

sectional trucks to support the ends of said.

girders, means connecting said trucks to the ends of the girders to:prevent horizontal movement of the trucks relative to the girders, saidmeans yieldingly connecting the ends of said girders to the trucks topermit ers, said means yieldingly connecting the ends of said girders tothe trucks to permit of limited vertical movement of the girdersrelative to the trucks, traction wheels on said trucks, and means forpositively rotating the traction wheels on, at least one of said trucks.

10. A turntable comprising main girders, sectional trucksto support theends of said girders, means connecting said trucks to the ends of saidgirders to prevent horizontal movement of the trucks relative to thegirders, said means having springs yieldingly connecting the girders andtrucks to permit of limited vertical movement of the girders relative tothe trucks, means. for limiting said vertical movement, traction wheelson the trucks, and means for positively rotating said traction wheels.

11. A turntable comprising main girders, wheeled trucks at the ends ofsaid girders, said trucks being made in sections, and means connectingthe truck sections, said means being arranged to permit of limitedvertical movement While preventing relative horizontal movement of oneend section relative to the opposite end section.

12. A turntable comprising main girders, a center bearin therefor,wheeled trucks at the ends of said girders, means connecting the trucksto the main irders, and arranged to permit of limited, re ative,vertical move ment and to prevent relative horizontal movementtherebetween, and. means for rotating the turntable.

13. A turntable comprising main girders, a center bearing therefor,wheeled trucks at the ends of said girders, means connecting thetrucks'to the main girders, said means 14. A turntable comprising maingirders, gearing connecting said shaft to a truck a center bearingtherefor, Wheeled trucks at Wheel, and a motor on said turntable for theends of said girders, means connecting driving said shaft. re the trucksto the main girders, arranged to In testimony whereof I have hereuntoset 5 permit of limited, relative, vertical movemy hand.

ment and prevent relative horizontal 1novement therebetween, a drivingshaft, reducing LOUIS H. SHOEMAKER.

Copies 01 this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G."

